MC68340 datasheet(324/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

7- 29

Start Break—The start break command forces the channel's TxDx low. If the transmitter

is empty, the start of the break conditions can be delayed up to one bit time. If the

transmitter is active, the break begins when transmission of the character is complete. If

a character is in the transmitter shift register, the start of the break is delayed until the

character is transmitted. If the transmitter holding register has a character, that

character is transmitted after the break. The transmitter must be enabled for this

command to be accepted. The state of the

CTS

≈ input is ignored for this command.

Stop Break—The stop break command causes the channel's TxDx to go high (mark)

within two bit times. Characters stored in the transmitter buffer, if any, are transmitted.

Assert

RTS—The assert RTS command forces the channel's RTS

≈ output low.

Negate

RTS—The negate RTS command forces the channel's RTS

≈ output high.

TC1–TC0—Transmitter Commands

These bits select a single command as listed in Table 7-7.

Table 7-7. TCx Control Bits

TC1

TC0

Command

No Action Taken

Enable Transmitter

Disable Transmitter

Do Not Use

No Action Taken—The no action taken command causes the transmitter to stay in its

current mode. If the transmitter is enabled, it remains enabled; if disabled, it remains

disabled.

Transmitter Enable—The transmitter enable command enables operation of the

channel's transmitter. The TxEMP and TxRDY bits in the SR are also set. If the

transmitter is already enabled, this command has no effect.

Transmitter Disable—The transmitter disable command terminates transmitter operation

and clears the TxEMP and TxRDY bits in the SR. However, if a character is being

transmitted when the transmitter is disabled, the transmission of the character is

completed before the transmitter becomes inactive. If the transmitter is already

disabled, this command has no effect.

Do Not Use—Do not use this bit combination because the result is indeterminate.

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